coreboot_util: use enter to exit bootorder menu

Allow use of enter key for easier flow of execution

Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
3 jobs for coreboot_util
Status Job ID Name Coverage
  Build
canceled #12296
build

 
  Test
skipped #12298
allowed to fail
code_quality
skipped #12297
test